1991 240sx rough idle sputters over night?!

[hakosuka86]

hi

i had sum heating problems and when i though i had it all fixed drove to work no problem 30 mins.

still i think i need to make sure i have no bubbles on the system.------------------------\

so i came out 7 hours after go in the car turn it onand it started rough and it was sputtering i let it warm up thinking it was too cold drove off after and its was sputtering quite noticible

I made it home I swap to new spark plugsdrove around but still the same problem

ideas i have are:dirty fuel filter?dirty maf? really?bad timing?cold start plug went bad?

but i cant just spend money like crazy because im not in that position right now. i just need it fixed i have work tomorrow Thank you!!!!!

[MastaYu]

maybe an exhaust leak?

[hakosuka86]

well thank you,

ended up being my second fuel injector.

i tested by:turn car on and checking to see which spark plug wire didnt affect iddle.unplug #1 spark plug wire idle went down after 2 sec.plugged it back on

unplug #2 car DIDNT idle down nor a change was felt thus being #2 the one thats bad !!

#1#3#4 Did make idle go down when spark plug wire was unplugged!

so Next time for anyone that ever gets any syntoms like my Nissan do this test first!!

it wasnt fuel filter, fuel pump spark plugs or timing or exhaust leak or bad O2 sensor it was the injector so Next for sure do the injector test first!!!!